libdocument/ev-document-misc.c

   1 /*
   2  *  Copyright (C) 2009 Juanjo Marín <juanj.marin@juntadeandalucia.es>
   3  *  Copyright (c) 2007 Carlos Garcia Campos <carlosgc@gnome.org>
   4  *  Copyright (C) 2000-2003 Marco Pesenti Gritti
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2, or (at your option)
   9  *  any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  */
  20
  21 #include <config.h>
  22
  23 #include <string.h>
  24 #include <math.h>
  25
  26 #include <gtk/gtk.h>
  27
  28 #include "ev-document-misc.h"
  29
  30 /* Returns a new GdkPixbuf that is suitable for placing in the thumbnail view.
  31  * It is four pixels wider and taller than the source.  If source_pixbuf is not
  32  * NULL, then it will fill the return pixbuf with the contents of
  33  * source_pixbuf.
  34  */
  35 static GdkPixbuf *
  36 create_thumbnail_frame (int        width,
  37                         int        height,
  38                         GdkPixbuf *source_pixbuf,
  39                         gboolean   fill_bg)
  40 {
  41         GdkPixbuf *retval;
  42         guchar *data;
  43         gint rowstride;
  44         int i;
  45         int width_r, height_r;
  46
  47         if (source_pixbuf)
  48                 g_return_val_if_fail (GDK_IS_PIXBUF (source_pixbuf), NULL);
  49
  50         if (source_pixbuf) {
  51                 width_r = gdk_pixbuf_get_width (source_pixbuf);
  52                 height_r = gdk_pixbuf_get_height (source_pixbuf);
  53         } else {
  54                 width_r = width;
  55                 height_r = height;
  56         }
  57
  58         /* make sure no one is passing us garbage */
  59         g_assert (width_r >= 0 && height_r >= 0);
  60
  61         retval = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
  62                                  TRUE, 8,
  63                                  width_r + 4,
  64                                  height_r + 4);
  65
  66         /* make it black and fill in the middle */
  67         data = gdk_pixbuf_get_pixels (retval);
  68         rowstride = gdk_pixbuf_get_rowstride (retval);
  69
  70         gdk_pixbuf_fill (retval, 0x000000ff);
  71         if (fill_bg) {
  72                 for (i = 1; i < height_r + 1; i++)
  73                         memset (data + (rowstride * i) + 4, 0xffffffff, width_r * 4);
  74         }
  75
  76         /* copy the source pixbuf */
  77         if (source_pixbuf)
  78                 gdk_pixbuf_copy_area (source_pixbuf, 0, 0,
  79                                       width_r,
  80                                       height_r,
  81                                       retval,
  82                                       1, 1);
  83         /* Add the corner */
  84         data [(width_r + 2) * 4 + 3] = 0;
  85         data [(width_r + 3) * 4 + 3] = 0;
  86         data [(width_r + 2) * 4 + (rowstride * 1) + 3] = 0;
  87         data [(width_r + 3) * 4 + (rowstride * 1) + 3] = 0;
  88
  89         data [(height_r + 2) * rowstride + 3] = 0;
  90         data [(height_r + 3) * rowstride + 3] = 0;
  91         data [(height_r + 2) * rowstride + 4 + 3] = 0;
  92         data [(height_r + 3) * rowstride + 4 + 3] = 0;
  93
  94         return retval;
  95 }
  96
  97 GdkPixbuf *
  98 ev_document_misc_get_thumbnail_frame (int        width,
  99                                       int        height,
 100                                       GdkPixbuf *source_pixbuf)
 101 {
 102         return create_thumbnail_frame (width, height, source_pixbuf, TRUE);
 103 }
 104
 105 GdkPixbuf *
 106 ev_document_misc_get_loading_thumbnail (int      width,
 107                                         int      height,
 108                                         gboolean inverted_colors)
 109 {
 110         return create_thumbnail_frame (width, height, NULL, !inverted_colors);
 111 }
 112
 113 void
 114 ev_document_misc_get_page_border_size (gint       page_width,
 115                                        gint       page_height,
 116                                        GtkBorder *border)
 117 {
 118         g_assert (border);
 119
 120         border->left = 1;
 121         border->top = 1;
 122         if (page_width < 100) {
 123                 border->right = 2;
 124                 border->bottom = 2;
 125         } else if (page_width < 500) {
 126                 border->right = 3;
 127                 border->bottom = 3;
 128         } else {
 129                 border->right = 4;
 130                 border->bottom = 4;
 131         }
 132 }
 133
 134
 135 void
 136 ev_document_misc_paint_one_page (cairo_t      *cr,
 137                                  GtkWidget    *widget,
 138                                  GdkRectangle *area,
 139                                  GtkBorder    *border,
 140                                  gboolean      highlight,
 141                                  gboolean      inverted_colors)
 142 {
 143         GtkStyle    *style = gtk_widget_get_style (widget);
 144         GtkStateType state = gtk_widget_get_state (widget);
 145
 146         gdk_cairo_set_source_color (cr, highlight ? &style->text[state] : &style->dark[state]);
 147         gdk_cairo_rectangle (cr, area);
 148         cairo_fill (cr);
 149
 150         if (inverted_colors)
 151                 cairo_set_source_rgb (cr, 0, 0, 0);
 152         else
 153                 cairo_set_source_rgb (cr, 1, 1, 1);
 154         cairo_rectangle (cr,
 155                          area->x + border->left,
 156                          area->y + border->top,
 157                          area->width - (border->left + border->right),
 158                          area->height - (border->top + border->bottom));
 159         cairo_fill (cr);
 160
 161         gdk_cairo_set_source_color (cr, &style->mid[state]);
 162         cairo_rectangle (cr,
 163                          area->x,
 164                          area->y + area->height - (border->bottom - border->top),
 165                          border->bottom - border->top,
 166                          border->bottom - border->top);
 167         cairo_fill (cr);
 168
 169         cairo_rectangle (cr,
 170                          area->x + area->width - (border->right - border->left),
 171                          area->y,
 172                          border->right - border->left,
 173                          border->right - border->left);
 174         cairo_fill (cr);
 175 }
 176
 177 cairo_surface_t *
 178 ev_document_misc_surface_from_pixbuf (GdkPixbuf *pixbuf)
 179 {
 180         cairo_surface_t *surface;
 181         cairo_t         *cr;
 182
 183         surface = cairo_image_surface_create (gdk_pixbuf_get_has_alpha (pixbuf) ?
 184                                               CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24,
 185                                               gdk_pixbuf_get_width (pixbuf),
 186                                               gdk_pixbuf_get_height (pixbuf));
 187         cr = cairo_create (surface);
 188         gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
 189         cairo_paint (cr);
 190         cairo_destroy (cr);
 191
 192         return surface;
 193 }
 194
 195 GdkPixbuf *
 196 ev_document_misc_pixbuf_from_surface (cairo_surface_t *surface)
 197 {
 198         GdkPixbuf       *pixbuf;
 199         cairo_surface_t *image;
 200         cairo_t         *cr;
 201         gboolean         has_alpha;
 202         gint             width, height;
 203         cairo_format_t   surface_format;
 204         gint             pixbuf_n_channels;
 205         gint             pixbuf_rowstride;
 206         guchar          *pixbuf_pixels;
 207         gint             x, y;
 208
 209         width = cairo_image_surface_get_width (surface);
 210         height = cairo_image_surface_get_height (surface);
 211
 212         surface_format = cairo_image_surface_get_format (surface);
 213         has_alpha = (surface_format == CAIRO_FORMAT_ARGB32);
 214
 215         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
 216                                  TRUE, 8,
 217                                  width, height);
 218         pixbuf_n_channels = gdk_pixbuf_get_n_channels (pixbuf);
 219         pixbuf_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
 220         pixbuf_pixels = gdk_pixbuf_get_pixels (pixbuf);
 221
 222         image = cairo_image_surface_create_for_data (pixbuf_pixels,
 223                                                      surface_format,
 224                                                      width, height,
 225                                                      pixbuf_rowstride);
 226         cr = cairo_create (image);
 227         cairo_set_source_surface (cr, surface, 0, 0);
 228
 229         if (has_alpha)
 230                 cairo_mask_surface (cr, surface, 0, 0);
 231         else
 232                 cairo_paint (cr);
 233
 234         cairo_destroy (cr);
 235         cairo_surface_destroy (image);
 236
 237         for (y = 0; y < height; y++) {
 238                 guchar *p = pixbuf_pixels + y * pixbuf_rowstride;
 239
 240                 for (x = 0; x < width; x++) {
 241                         guchar tmp;
 242
 243 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
 244                         tmp = p[0];
 245                         p[0] = p[2];
 246                         p[2] = tmp;
 247                         p[3] = (has_alpha) ? p[3] : 0xff;
 248 #else
 249                         tmp = p[0];
 250                         p[0] = p[1];
 251                         p[1] = p[2];
 252                         p[2] = p[3];
 253                         p[3] = (has_alpha) ? tmp : 0xff;
 254 #endif
 255                         p += pixbuf_n_channels;
 256                 }
 257         }
 258
 259         return pixbuf;
 260 }
 261
 262 cairo_surface_t *
 263 ev_document_misc_surface_rotate_and_scale (cairo_surface_t *surface,
 264                                            gint             dest_width,
 265                                            gint             dest_height,
 266                                            gint             dest_rotation)
 267 {
 268         cairo_surface_t *new_surface;
 269         cairo_t         *cr;
 270         gint             width, height;
 271         gint             new_width = dest_width;
 272         gint             new_height = dest_height;
 273
 274         width = cairo_image_surface_get_width (surface);
 275         height = cairo_image_surface_get_height (surface);
 276
 277         if (dest_width == width &&
 278             dest_height == height &&
 279             dest_rotation == 0) {
 280                 return cairo_surface_reference (surface);
 281         }
 282
 283         if (dest_rotation == 90 || dest_rotation == 270) {
 284                 new_width = dest_height;
 285                 new_height = dest_width;
 286         }
 287
 288         new_surface = cairo_surface_create_similar (surface,
 289                                                     cairo_surface_get_content (surface),
 290                                                     new_width, new_height);
 291
 292         cr = cairo_create (new_surface);
 293         switch (dest_rotation) {
 294                 case 90:
 295                         cairo_translate (cr, new_width, 0);
 296                         break;
 297                 case 180:
 298                         cairo_translate (cr, new_width, new_height);
 299                         break;
 300                 case 270:
 301                         cairo_translate (cr, 0, new_height);
 302                         break;
 303                 default:
 304                         cairo_translate (cr, 0, 0);
 305         }
 306
 307         if (dest_width != width || dest_height != height) {
 308                 cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_BILINEAR);
 309                 cairo_scale (cr,
 310                              (gdouble)dest_width / width,
 311                              (gdouble)dest_height / height);
 312         }
 313
 314         cairo_rotate (cr, dest_rotation * G_PI / 180.0);
 315         cairo_set_source_surface (cr, surface, 0, 0);
 316         cairo_paint (cr);
 317         cairo_destroy (cr);
 318
 319         return new_surface;
 320 }
 321
 322 void
 323 ev_document_misc_invert_surface (cairo_surface_t *surface) {
 324         cairo_t *cr;
 325
 326         cr = cairo_create (surface);
 327
 328         /* white + DIFFERENCE -> invert */
 329         cairo_set_operator (cr, CAIRO_OPERATOR_DIFFERENCE);
 330         cairo_set_source_rgb (cr, 1., 1., 1.);
 331         cairo_paint(cr);
 332         cairo_destroy (cr);
 333 }
 334
 335 void
 336 ev_document_misc_invert_pixbuf (GdkPixbuf *pixbuf)
 337 {
 338         guchar *data, *p;
 339         guint   width, height, x, y, rowstride, n_channels;
 340
 341         n_channels = gdk_pixbuf_get_n_channels (pixbuf);
 342         g_assert (gdk_pixbuf_get_colorspace (pixbuf) == GDK_COLORSPACE_RGB);
 343         g_assert (gdk_pixbuf_get_bits_per_sample (pixbuf) == 8);
 344
 345         /* First grab a pointer to the raw pixel data. */
 346         data = gdk_pixbuf_get_pixels (pixbuf);
 347
 348         /* Find the number of bytes per row (could be padded). */
 349         rowstride = gdk_pixbuf_get_rowstride (pixbuf);
 350
 351         width = gdk_pixbuf_get_width (pixbuf);
 352         height = gdk_pixbuf_get_height (pixbuf);
 353         for (x = 0; x < width; x++) {
 354                 for (y = 0; y < height; y++) {
 355                         /* Calculate pixel's offset into the data array. */
 356                         p = data + x * n_channels + y * rowstride;
 357                         /* Change the RGB values*/
 358                         p[0] = 255 - p[0];
 359                         p[1] = 255 - p[1];
 360                         p[2] = 255 - p[2];
 361                 }
 362         }
 363 }
 364
 365 gdouble
 366 ev_document_misc_get_screen_dpi (GdkScreen *screen)
 367 {
 368         gdouble dp, di;
 369
 370         /*diagonal in pixels*/
 371         dp = hypot (gdk_screen_get_width (screen), gdk_screen_get_height (screen));
 372
 373         /*diagonal in inches*/
 374         di = hypot (gdk_screen_get_width_mm(screen), gdk_screen_get_height_mm (screen)) / 25.4;
 375
 376         return (dp / di);
 377 }
 378
 379 /* Returns a locale specific date and time representation */
 380 gchar *
 381 ev_document_misc_format_date (GTime utime)
 382 {
 383         time_t time = (time_t) utime;
 384         char s[256];
 385         const char fmt_hack[] = "%c";
 386         size_t len;
 387 #ifdef HAVE_LOCALTIME_R
 388         struct tm t;
 389         if (time == 0 || !localtime_r (&time, &t)) return NULL;
 390         len = strftime (s, sizeof (s), fmt_hack, &t);
 391 #else
 392         struct tm *t;
 393         if (time == 0 || !(t = localtime (&time)) ) return NULL;
 394         len = strftime (s, sizeof (s), fmt_hack, t);
 395 #endif
 396
 397         if (len == 0 || s[0] == '\0') return NULL;
 398
 399         return g_locale_to_utf8 (s, -1, NULL, NULL, NULL);
 400 }